/*
 * Copyright 2011 Clean GWT
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */
package com.cleangwt.uibinder.client;

import com.google.gwt.user.client.ui.HTMLPanel;
import com.google.gwt.user.client.ui.Widget;

/**
 * A HTML panel implements {@link TemplateSupport} for supporting element wrapping.
 * 
 * @author Jess
 * @version 1.0
 * @since 1.0
 * @see RequiresTemplate
 * @see RequiresWebTemplate
 */
public class TemplatePanel extends HTMLPanel implements TemplateSupport {

  /**
   * Creates a template panel.
   */
  public TemplatePanel() {
    super("");
  }

  /**
   * Creates a template panel with the given html.
   * 
   * @param html the html
   */
  public TemplatePanel(String html) {
    super(html);
  }

  @Override
  public void wrap(Widget child) {
    // Assert that the element is attached to the template.
    assert child.getParent() == null && getElement().isOrHasChild(child.getElement());

    // Logical attach.
    getChildren().add(child);

    // Adopt.
    adopt(child);
  }

}
